Hi Rinus,
Thanks for reaching out to us!
I believe that you’re using our program version for Windows/Mac. In order to add several images from Google Photos to your collage, you need to select “Google Photos” in the Photo Basket dropdown (at the very bottom of the editor) and then drag them into your collage one by one.
Alternatively, if you click the 1st icon along the top right of your image, it will “Auto-fill” the collage, using the first images in the basket.
I hope that helps, but if you have any further questions, please let us know!
– Regards, The Ribbet Team